Cutter-carrying head for multiple lathes



` l.. E. coBB GUTTER GARRYING HEAD FOR MULTIPLE LATHES Sept. 126, 1930. r

Filed April 21, 1928 ANR: ,.y.`\ f\`\v v N L". #kum M P if;

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' Sept. 1s, 1930.,v

4 ASheets-Sheet, 2

' CUTTER CARRYING HEAD FOR MULTIPLE LTHES Jwuento'o f v M f alito/amg Sept. 16, 1930. I L, E; 0BBl 1,776,180

CUTTER CARRYING HEAD FOR MULTIPLE Lunas FiledApril 21, 1928 4 Sheets-Sheet 3 Sept. 16, 1930. l L. E, COBB 1,776,180

CUTTER CARRYING HEAIS FOR MULTIPLE LA'rHs's- Filed April 21, 1928 4 Sheets-Sheet 4 lllIl Patented Sept. 16, 1930 LESTER E.coBB, on NORWAY, MAINE CUTTER-CARRYING HEAD non MULTIPLE LATHES y Application meenam `ai,

Myinvention relates to multiple turning lathes in which blocks of wood of uniform length are fed to rotating disks or other car riers for a plurality of shafts, one of'which carries a Series of positively rotated heads each corresponding to thev head stock of a., lathe, and the other of which carries a correspondingseries of shafts each free to rotate but movable longitudinally of their axis each corresponding to the tail stock of a lathe, so that each block is clamped between a rotated head and the longitudinally movf able shaft opposite it and rotated rapidly while being carried lbodily onward by the rotation `of the disks, being subjected as it is carried onward to the action of a suitably shaped cutter which acts uponthe rotating block to shape it. Machines of this general character are well known andare shown in a number of United States Patents such, for instance, `as the patent toT. D. Smith, Number 1,001,561, dated Aug. 22, 1911. The general construction of such a machine forms no part of my present inventioncwhich relates particularly to the cutter carrying head and means by which the cutters are brought into action and withdrawn.

` With the objects above indicated and other objects'hereinafter described in view my invention consists in the construction andcombination of parts hereinafter described and claimed. j

Referring to the drawings l' F'gure 1 is a perspective viewof a cutte carryinghead embodying my invention. VFigure 2 is a face view partly broken away of the Vcutter carryingV head, the main shaft ofthe machine being' shown in `cross-section'. Figure 3 is va cross sectional view'pa-rtly broken away of the cam which controls the cutter carrying arms. Figure 4 is a perspective view of the cam shown in Figure 3. Figure 5 is a perspective view of the cutter carrying arms and the cutters showing the parts separated. Y,

Figure 6 is a perspective viewof a blank ready for insertion in the machine, and Figure 7 is a perspective view of afinished 192s. serial no. einem.

yahead 3 the end of which isiprovided with vPATiri-Ni" OFI-1615: f

teeth t adapted to engage Ione end fof ay block of wood so that when the spindle 21is rotated the block will be rotated, the other Vend of fthe block being held as in an ordinary turni ing latheby a spindle opposite to andinline with the spindle 2 of the head 3 asin the patent to Smith above referred, to. VThe spindles 2 each'carry a' pulley 5, the pulleys of the several spindles 2 being operatively connected together by belt 6which is `driven bybelt 7 from any convenient power.y Be-k tween the carriers for spindles 2 and the carriers ,for the .opposing spindles is arranged the cutter carrying head comprising a vdisk Scarrying a series of stub shafts v10 .on which are mounted arms 11 carrying the cutters. Fromthe disk 8 `extends a hub 9 which by .set screw 12, or other convenient means, is secured on shaft 1 so that disk 8 isso secured to shaft 1 that it will rotate with it. The cutter carrying arms 11 are each L shaped, the laterally extending leg 112 of the Lcarrying at its free end al pin 13 on which is journalled a roller 14, which extends into the hollow of a cam ,l'formed on the inner face of a rim 16 carried by a cam disc 17and extending'at right angles to theface of this disk. Cam disk 17 is held stationary by n means of an arm 18 extending radially from 4 it, preferably downward, andbolted or other? wise-secured to the frame of the machine.

This cam disk is arranged between the cutter carrying head and the rotating head .3. The

other leg 111 ofthe L extends inward towards the shaft l andhas at its end an fit over a stubshaft 10 on disk 8.

' The` cam 15 is so formed that the portion of its camsu'rface from 20 to 21 ison an arc lof a circle of relatively short radius while from '21 to 22 its radial distance'from the centre of the disk gradually'increases and from 22 to 20 its radial distance is sharply openingto lessened. VBy reason of this form of .the cam Y the rollers 14 while traveling from 20 to 21 are held toward the centre of shaft 1 so as to hold their cutters in retracted position; while traveling from 21 to 22 the rollers 14 are permitted to move outward to move their cutters into engagement with the block of wood to be turned and by the portion of the cam between 22 and 20 the rollers are moved inward to be held in their retracted position by the portion 20 to 21. A spring 23 within the path of movement of rollers 14 is arranged to press outward against these rollerswhile.theypare traveling from 21 to 22 so as to force them yieldingly outwardgagainst; ornearly against f.

the surface of the cam. This spring 23 may be so secured at one end to thedislr'l17 in anyconvenient manner as byv angle plate 24 that its free-endwill extend in the direction of movement of the rollers 14 opposite the portion of the cani between 21 and 22. The rotation of disk 8, particularly if at high speed, tends bycentrifugal action to holdprollers 14 against the surface of cam 15 and so to throw f the cutters outward into. action upon the wooden blocks to be turned. The spring 23 aids this centrifugal ,action and ensures a gradual outward movement of the cutters as they bite further and furt-her into the material of the wooden bloclibeing turned.

The cutter carrying arms k11 are each provided with a plate 25 extending outward from the junction of its two legs Iat substantially right angles tothe leg which carries roller 13 and also extendinglaterally in a direction 'away fromcam disk 17. This plate is carried by theA leg 111` of arm 11 and is machined off. on its outer face to receive the cutters 26, 27 and 28. Anangle plate 29 having its inwardly extending portion 30 filling the free end of plate 25 servesto clamp t-he cutters to plate 25, the portion 30 being secured to the end of plate 25 by screws 31. The main portion of angle plate 29 is provided with threadedopenings 32, 32, and 33, 33, to receive vscrews 34, 34, and 35, 35, by which the side cutters 26 and4 28 may be firmly secured in place. Similar threaded openings 36, 36 may be provided for'clamping the centre cutter 27. lhe outward movement of each vof the cutter carrying arms is adju'stably regulated by a setjserew 40 carried by arm 41 of a plate 42 secured on disk 8 by screw 43, the inner end of set screw 40 being in the path of movement of the free end portion of cutter carrying arm 11. Y

V The number of cutters may be varied and their cutting edgesmay be of any shape necessary to form-the particular article desired. The cutters 26, 27, 28, here shown are shaped to form a spool such as is used to hold silk, ycotton or other `thread, the cutter 27 being adapted to 'form the central part of the spool with the innerY faces of the heads and cutters 26 and 28 being adapted to turn o the outer faces of the heads.

In operation a block of wood being in place between a head3 and the opposite tail stock spindle, the shaft 1 being rotated in the direction indicated by arrows on Figures 1, 2 and 3, the rotation of the shaft 1 carrying with it the heads 3, these heads being themselves rotated on their own axes, and also carrying with it the cutter carrying head, the cam 15 permits the cutter carrying arm 11 to move outward under the influence of spring 23 as well as by centrifugal force. As the arin swings outward the cutters 26, 27, 28, are brought into Contact with the block to graduallyjcutgf.way material so as to leave `the block shaped to the spool form desired. This turning or shaping of the wooden block is completed Vwhile the roller 14 is passing from points 21l to 22 of cam 15. At this point in the rotation of shaft 1 and the parts carriedby it the spindle opposite head 3 is drawn backas in the Smith patent labove referred toto release the spool which is thrown off by contact with a suitable fixed arm.

In the machine shown six heads ,3 and a corresponding number of cutter carrying arms are shown and, of course, a corresponding number of the tail stock shafts must be used. But the number of these sets of parts may be varied Vas desired depending upon the diameter given to the cutter carrying head and the parts carrying the heads 3 and depending also on the diameter of the article to be turned. l

It will, ofcourse, be understood that details of construction and arrangement may be varied without departingfrom the-spirit of my invention.

Having thus described-my invention what I claim is 1. In a machine of the class described having a main shaft and rota-ry work carriers mounted to revolve'with the main shaft about its axis, a cutter carrying head rotatingV with said shaft having a plurality of cutter carrying arms each pivoted on an axis parallel with the main shaft having. a cutter at its outer end and having an extensionwhose end is adapted'to be engaged by a cam, a iixed cam. plate having a cam formed thereon adapted to act upon the inner ends of said extensions of the cutterLv carrying .arms to swing their cutter carrying ends away from the axis of the shaft and yieldingmeans adapted-to act upon the said extensions of the cutter carrying arms to .aidl in swinging their cutter carrying ends away from the'axis of the shaft.

2. In a'machine of thejclassdescribed hav-v ing a main shaft and .rotary work carriers mounted to revolve with the main-shaft about its axis, a cutter carrying' head rotating with said shaft having-a plurality of cutter lcarrying arms each pivoted on an axis parallel with the main shaft` having a cutter at its outer end and having an extension whose end Vis adapted to be engaged by a cam, a fixed cam plate having a cam formed thereon adapted to act upon the inner ends of said extensions of the cutter carrying arms to swing their cutter carrying ends away from the axis of the shaft, and a spring carried by the cam plate adapted to act upon the said extension of the cutter carrying arms to aid in swinging their cutter carrying ends away from the axis of the shaft. l

3. In a machine of the class described having a. main shaft and rotary work carriers mounted to revolve with the main shaft about its axis, a cutter carrying head rotating with said shaft having a plurality of cutter carrying arms each pivoted on an axis parallel with l the main shaft having a cutter at its outer end and having an extension, the inner end of which carries a roller adapted to be engaged by a. cam, a fixed cam plate having a rim at its periphery extending towards the cutter head said rim having on its inner face a cam adapted to act upon the inner ends of said extensions of the cutter carrying arms to swing their cutter carrying ends away from the axis of the shaft, and yielding means carried by the cam plate adapted to act upon the said extensions of the cutter carrying arms to aid in swinging' their cutter carrying ends away from the axis of the shaft.

4. In a machine ofthe class described having a main shaft and rotary work carriers mounted to revolve with the main shaft about its axis, a cutter carrying head rotating with said shaft having a plurality of cutter carrying arms each pivoted on an axis parallel with the main shaft having a cutter at its outer end and having an extension whose end is adapted to be engaged by a cam, a fixed cam plate having a peripheral rim extending towards the cutter head having on its inner face a cam adapted to act upon the inner ends of said extensions of the cutter carrying arms to swing their cutter carrying ends away from the axis of the shaft, and a spring sef cured at one end to the cam plate having its free end opposite the cam and adapted to act upon the said extensions of the cutter carrying arms to aid in swinging their cutter carrying ends away from the axis of the shaft. In testimony whereof, I hereunto aix my signature. f

LESTER E. COBB. 

